Thing you use to look up words you don't understand with definitions filled with words you don't understand and need to look up to understand the definition of the first word you didn't understand.

Man:Look up wishy-washy for me in the dictionary
Woman:*looks up wishy-washy in the dictionary*
Dictionary reads: Wishy-Washy: Ineffectual
Ineffectual: Futile
Futile: Futilis that pours out easily, useless